what wrong with my baby

[305chevy c-10]

hi guys my 85 c10 with 305 engine cuts back when i drive it .......it runs fine at idle or reving the motor in park but if i drive it slow it does fine ..trans shifts fine while just easing around but when i give it gas it just acts like it cuts back ....i was late for work one morning  and drove it hard ....later that day it started not wanting to go .all fluids are full ........any ideas guys.....is something stuck open or close....................thanks fellows

[Lt.Del]

junk in the gas
check gas filter

check timing just in case.

accelerator pump?

[zieg85]

catalytic converter clogged???

[choptop]

plugs, wires, or other ignition breaking down under load.

[VileZambonie]

Put a vacuum gauge on it and run it into the cab. Drive it and report your vacuum readings

[305chevy c-10]

she ready now............bad plugs and burnt plug wires from headers and vac hoses dry rotted............thanks CHEVY BOYZ